Self-amalgamating material

• US 4,788,245 A
• Filed: 10/22/1987
• Issued: 11/29/1988
• Est. Priority Date: 03/21/1986
• Status: Expired due to Fees

• Current Assignee: Radiation Dynamics, Inc. (Ion Beam Applications s.a.)
• Original Assignee: Radiation Dynamics, Inc. (Ion Beam Applications s.a.)
• Inventors: Anderson, James
• Primary Examiner(s): Lilling, Herbert J.
• Application Number:
  US07/112,041
• Time in Patent Office: 404 Days
• Field of Search: 524/525, 524/496, 524/519, 524/518, 428/36, 428/355
• US Class Current: 524/518
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C09J 123/02 not modified by chemical after-treatment
• CPC Class Codes: C09J 123/22 Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefines
• CPC Class Codes: C09J 123/283 Halogenated homo- or copolymers of iso-olefines

Abstract

A material capable of self-amalgamation without adjunct heating and use as a wraparound tape at substantially the full range of ambient terrestrial temperatures composed of a rubber component, a polyisobutylene tackifier, a C₂ -C₃ polyolefin and filler is provided.

Claims

1. A conduit wrapping, comprising:

a uniformly blended strip of self-amalgamating material composed of 3-14 parts polyolefin, 10-20 parts solid polyisobutylene tackifier, carbon black and a rubber blend composed of conjugated diene butyl rubber and halo C₄ -C₅ olefin rubber.

2. A conduit wrapping according to claim 1 having 47-50 parts of the rubber blend.

3. A conduit wrapping according to claim 1 where the tackifier is poly-isobutylene.

4. A conduit wrapping according to claim 1 having 13-14 parts tackifier.

5. A conduit wrapping according to claim 1 where the polyolefin is a C₂ -C₃ polyolefin.

6. A conduit wrapping according to claim 1 where the polyolefin is polyethylene.

7. A conduit wrapping according to claim 6 having 4-7 parts polyethylene.

8. A conduit wrapping according to claim 1 further comprising an additional rubber component selected from the group consisting of EPDM and polynorborene.

9. A conduit wrapping according to claim 1 which is cross-linked with ionizing irradiation.

10. A conduit wrapping according to claim 9 where the ionizing irradiation employed to effect cross-linking is an electron beam.

11. A conduit wrapping according to claim 10 which has been exposed to an electron beam dose of 2-8 megarads.

12. A conduit wrapping according to claim 1 further including an antioxidant.